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Couldn't you hook up the module from a working factory fan to the aftermarket fan.

You definitely could and that is my second option if I can't figure this out. I'm currently trying to source one online somewhere. You can't just buy the controller though; you have to buy the entire fan assembly. :/

You definitely could and that is my second option if I can't figure this out. I'm currently trying to source one online somewhere. You can't just buy the controller though; you have to buy the entire fan assembly. :/

I have figured out how to bypass or activate fan with out the speed control unit but it run at one speed with no problem ive had it like that for over a year. my fan got stuck on was killing my battery so it had power so what i did was cut the 12v wire and tied in a $10 relay the relay allows the cumputer to turn the fan on when u turn the key so the fan is always on but cant hurt anything the wire i choose to flip on the relay was the wire that people use to turn on angel eyes from dme u can find info on angel eyes diy
i have pics of fan reay but have not posted hit me up if u need help
i think i have figured out a cheaperway than buying a fan in need to make up a diy.

I know I'm reviving an old thread - but it seemed as though some of you were on to something with this issue. Aside from all the alternative fixes - I'm having an identical issue. I've replaced all related sensors - fan - thermostat & all other cooling system components.

Issue is still, fan does not turn on in any circumstance - no codes either. A/C works when the engine builds revs but cuts out when at idle, I have recharged the a/c system to ensure it is building enough pressure - haven't checked the condenser (though I feel this is far from the issue). I've tested all connection to the temp sensor/thermostat/fan module/ & that little black box that is attached to the top of the fan. All connections are good.

I've also checked all fuses that even have a loose correlation with the cooling/fan system.

Even when I fed the fan switch my own trigger, it would not turn on. I could how-ever turn on temporarily with the scan tool.

Only conclusion I can come to is my ecu is not (for w/e reason) sending a signal for the feedback it is getting from the sensors.

Can anyone chime in on this? Previous issues/fixes/possible brainstorming?